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 A188252 Number of arrangements of 6 nonzero numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero 0

%I

%S 0,300,1632,7092,16484,43440,75080,142532,232432,380244,525668,841504,

%T 1099064,1531092,2070976,2785252,3396316,4539424,5414024,6981628,

%U 8554708,10387240,11982424,15101088,17498972

%N Number of arrangements of 6 nonzero numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero

%C Row 4 of A188249

%e Some solutions for n=4

%e .-4....2...-4...-1....2....4....3....4....3....3....1...-3...-1...-2...-3....3

%e ..1...-3...-2....2...-1...-1....1...-2...-2....4...-4....3....3....3...-1...-4

%e .-2...-3...-4...-1...-2...-2...-2....2....2....4...-4....1...-2....1...-2...-4

%e .-4....3....4...-4....1....2...-4...-2...-1...-2....1....2....3....3....2...-4

%e ..1....3...-3...-3...-1....2....3...-4...-4....4...-4...-4....3....1....1....4

%e ..2...-1...-4....4...-3....1....1...-2...-2...-3....1...-3....2...-3...-3...-1

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 25 2011

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Last modified October 21 16:25 EDT 2019. Contains 328302 sequences. (Running on oeis4.)